[#318] Mention timestamped reports not generated by default

With PIT 1.9.6+.

CHANGELOG.md

@@ -5,10 +5,13 @@
  - Support for thresholds in aggregated metrics (requires PIT 1.9.9+) - [#319](https://github.com/szpak/gradle-pitest-plugin/issues/319) - PR by [pfoerd](https://github.com/Pfoerd)
  - Support for `verbosity` flag, "spinner" disabled by default - [#267](https://github.com/szpak/gradle-pitest-plugin/issues/267) - PR by [Carsten Otto](https://github.com/C-Otto)
  - PIT 1.9.11 by default
+ - Do not produce timestamped reports by default for PIT 1.9.6+ - suggestion by [Siddardha Bezawada](https://github.com/SidB3)
  - Minimal supported PIT version is 1.7.1 (due to "verbosity" flag used by default)
- - Deprecated `verbose` flag - `verbosity` is much more versatile, especially when used from the Gradle plugin
+ - Deprecate `verbose` flag - `verbosity` is much more versatile, especially when used from the Gradle plugin
 
-**Compatibility notes**. Due to the usage of the "verbosity" flag by default, the minimal supported PIT version is 1.7.1 (released 2021-09-29)
+**Compatibility notes**
+1. Due to the usage of the "verbosity" flag by default, the minimal supported PIT version is 1.7.1 (released 2021-09-29).
+2. Due to the changes in PIT 1.9.6, timestamped reported are not generated by default (with PIT 1.9.6+). It still can be enforced in the GPP configuration.
 
 
 ## 1.9.0 - 2022-08-19